What is the main function of a cell wall in plant cells?

The main function of a cell wall in plant cells is to provide structural support. The cell wall is a rigid outer layer that surrounds the plasma membrane and is primarily composed of cellulose. This structure helps maintain the shape of the cell, protects it from mechanical stress, and prevents excessive water absorption that could cause the cell to burst.

In addition to support, the cell wall plays a key role in defining the plant's overall structure and posture, allowing plants to grow tall and withstand various environmental stresses. The rigidity provided by the cell wall creates turgor pressure, which is crucial for maintaining cell integrity and overall plant health.

While the other options touch on important processes in cellular function—such as cell division, transport mechanisms, and photosynthesis—they do not specifically relate to the primary role of the cell wall, which is fundamentally about providing structural support and protecting the cell's internal components.